Fuel supply pump



July 11 1933. L. BEE H 1,917,690

' FUEL SUPPLY PUMP Filed Jui 12, 1952 a z; a i! Ii M - INVENTOR A x1.QM;

ATTORNEY Patented July 11, 1933 nnrra' snares rarau'r orricqa EIQ'UIEBEEH, @E LQIIGMEADUW, HASSACEUSEETS, ASSIGNOR T UNITED AMERICAN lil fifiGGBCEOBATIQH, G1 SPBDTGZTIELD, MASSAGHUSETTS, A COEPORATIGN OF NEW roanMEL SUEELY rum Application filed duly 12,

This invention relates to an improvement in fuel pumps and particularlya pump to supply fuel for internal comhustion engines.

An object of the invention is to provide a pump adapted to inject fuelinto sp-called low compression engines for automot1ve,av1 ation, marineor stationary use, and of the type on which carburetors are usuallyemployed and in which the degree of compression does not causeself-ignition of the fuel therein. Such engines usually operate on thetwo or four-cycle principle and the en.- gine for which my improved pump1s intend" ed is similar.

l-leretofore with engines having carburetors it has been customary toforce either an alone into the combustion chamber of the engine and theninject fuel after the'completion of the intake period and after theintake valves are closed; or to inject fuel into the air drawn into theengine during the intake period and at a predetermined instant in theEourse thereof. In previous fuel pumps for injecting fuel into saidengines the fuel alone passes through the pump.

lt is another object of my invention to provide a pump which iorces amixture of air and fuel into the engine at a predetermined instant; andby causing the pump to furnish both the air and fuel together betterregulation can be obtained and h ghe r efficiency oi operation for theengine tselr.

An embodiment of the invention 1s set forth in the accompanying drawingand described hereinafter; but 1, of course, reserve the right to makechanges in the shape, size, and arrangement of the parts without goingbeyond the principle of the invention or exceeding the scope of theappended claims. On the drawing: a Fig. 1 shows a, pump according to my1nvention in section, and

Fig. 2 is a detail. lhe pump comprises a casing or hous ng 1 withbearings for a drive shaft 2 carrying an eccentric 3. This eccentricoperates in a space or cavity 4 of the casing 1 and the encircling strap5 thereof has an anti-friction bearing between it and the eccentric 3itself. Extending outward from the strap 5 is a 1932.. serial Ho.622,07.

perforated lug or lobe 6 which is shown connected to the plunger 7. Thepump barrel 8 receives the plunger 7; and as many such barrels as arerequired will be afixed to the easmg 1 in any suitable manner,corresponding to the number of cylinders of the engine on which thepumpis mounted.

Each pump barrel 8 will be provided with a d scharge conduit 9 leadingto one of the engine cylinders and each plunger 7 will have anangle-shaped duct 10 opening through the inner end of the plunger and atone side to put the conduit 9 into communication with the compressionchamber 11 of the barrel 8 at the correct instant. The fuel is conductedto the pump barrel 8 through a pipe 12 and intake passage 13 enteringthe chamber 11 at such a point that it will be uncovered by the plungernear the outer end of its stroke, and the pump barrel 8 will also havean air port 14 adjacent the duct 13 to be overrun by the plunger 7 whenthe suction or intake stroke thereof is about finished. The pressurewhich the pump produces in the chamber 11 will of course be less thanthe ignition pressure of the fuel entering this chamber.

011 the suction stroke of the plunger 7 the fuel is drawn in through thepipe 12 and duct 13 as soon as the plunger overruns this duct. The sideport of the passage 10 in the piston 7 is now out of registry with thedischarge conduit 9 and this condition continues for part of the suctionstroke of the piston in the cylinder to which the conduit 9 leads. Onthe suction stroke of the plunger 7 itself the end of the port in theside of this plunger remains in registry with the conduit 9 for a shortperiod, thus creating a suction on the conduit 9 relieving this pipe andthe injection nozzle 7 and thereon in the engine cylinder of allpressure, and thereby prevent after-drip of fuel.

As soon as the plunger closes the conduit 9 the pressure in the chamber11 falls and when the pump plunger passes down far enough the duct 13 isopened. The fuel then passes into the cylinder 11 and on furthermovement the plunger opens the port 14, restoring the pressure in thechamber 11 to atmosphere. Hence no more fuel enters this chamber, butair flows in and mixes with the fuel. On its return or compressionstroke the port 14 and duct 13 are closed in succession. Then the airand fuel mixture in the chamber 11 is compressed and as soon as the duct10 registers with the conduit 9 the compressed mixture will flow throughthis pipe to the fuel nozzle of the engine and enter the combustlonchamber thereof.

The duct is controlled by a needle valve 15 having a gear head 16 whichcan be adjusted by a ring gear 17 which is'rotatably mounted on thehousing 1 in any suitable way. This ring gear may be turned by a lever20 wh1ch can be connected to 'move 1n unison with the air throttle leverof the engine.

The upper end of the pump barrel 8 IS in the form of a boss 21 closed bya cap 22 and from the side of the barrel 8 projects a boss 23 containingthe duct 13; the outer end of this boss being closed by ,a perforatedcap 24 which ma contain suitable packing surrounding t e needle valve15. On the top of the pro ection 23 is an internally threaded boss orhollow projection 25 containing a packin gland 26 to enable the fuelsupply pipe to connected to the pump. The needle valve 15 is of coursethreaded in the boss 23.

To lubricate the plunger 7 a hollow boss 27 is formed on the side of thebarrel 8 with an oil hole 28 at its inner end assing through the wall ofthe barrel 8 and c osed at its outer end by a cap 29. The plunger may besurrounded by a groove 30 which receives the oil when it registers withthe o ening 28.

To simplify the installatlon of this pump the shaft 2 may also beemployed to operate the timer 31 at the same speed as the pump itself.

I can also provide regulation by connecting an air bellows between thethrottle valve and the device 15 arranging this bellows so that it isconnected to the inlet manifold of the engine to contract or be expandedby'the degree of compression therein and thus change the degree ofopening of the needle valve.

The means for, driving the plunger from the shaft 2 and eccentric 3 asshown in Fig. 1 should be viewed as diagrammatic only; for

' the connections between the eccentric 3 and the strap 5 and theplunger 7, when several ppmps are driven from the same shaft, can

properl designed and made by anyone skilled int is art. Such connectionsare not part of this invention and no claim therefor is made herein;

The device is thus very simple and unlikely to get out of order andcapable of very eflicient operation. The air and fuel are thoroughlymixed in the chamber 11 and when discharged through the pipe 9 to theparticular cylinder, combustion occurs at once and is quickly completed.

Having described the invention, what is claimed is:

plunger movable therein, a discharge pipe a supply pipe and an air ortin the barre in position to be overrun y the plunger at the outer end ofits stroke and connecting the interior of the barrelwith the atmosphereadjacent the supply pipp, said barrel and plunger forming a.cham er andbein formed so that the interior walls of sai chamber are rigidthroughout.

2. A pump comprising a plun er, a barrel for the lunger with a supplyuct leadin into the arrel and an air ort adjacent sai duct, both theduct and t e air port being successively overrun by the piston on itsoutstroke, and a pi e connected by the piston to the interior 0 thebarrel on the in-stroke of the piston, said barrel and plunger forming achamber and being formed so that the interior walls of said chamber arerigid throughout.

3. A pump comprising a plunger, a compression barrel receivin theplunger, a duct having a port commumcating with the barrel and a supplypipe connected to said duct, an air port adjacent the said duct, saidduct and said port being adapted to be overrun successively by theplunger on its 'outstroke, a delivery conduit connected to the cylinder,

the plunger having an L-shaped passa e opened through its inner end andone si e to put the delivery conduit in communication with the barrel onthe compression stroke of the plunger, said barrel and plunger forming achamber and being formed so that the interior walls of said chamber arerigid throughout.

4. A pump comprising a compression barrel having a boss at one side andmeans received therein for connecting a discharge.

pipe to said barrel, the latter also having a longer boss containing aduct for the admission of fuel, means on said last-named boss forconnecting a supply pipe to the barrel, a needle valve controlling saidduct,

a gear on the outer end of said valve and a gear meshing with said firstgear to enable said valve to be turned and regulated.

5. A pump comprising a plunger, a barrel for the plunger with a supplyduct leading .1

into the barrel and an air ,port adjacent sai duct, both the duct andthe air port being successively overrun by the plunger on its outerstroke, and a discharge pipe connected by the plunger to the interior ofthe barrel on the in-stroke of the plunger, the barrel having alubricating opening and the plunger a groove to register with saidopening, said barrel and said plunger enclosing a chamber and being soformed that the walls of said chamber are rigid throughout.

6. A pump comprising a compression barrel having a boss at one side andmeans received therein for connecting a discharge ipe to the barrel, thelatter also having a 55 1. A pump comprising a barrel and a onger bosscontaining a duct for the admission of fuel, a hollow projection on saidlastcontaining a duct for the admission of fuel, named boss forconnecting .a suppy pipe to a hollow projection on said last-named bossthe barrel, a needle valve controllinfi said for connecting a suplpllypipe to the barrel, duct, and means for adjusting said va ve. aneedlevalve contro g said duct and gear- 7. A pump comprising a compressionbaring on the outer end of said valve to enable rel havln a boss on oneside, and means said valve to be turned and regulated.

received t erein for connecting a discharge In testimony whereof I afiixm si ature.

pipe to the barrel, another boss on the barrel LOUIS B EH. 1o 75 v r I 7Q I 2s 1 I a no a no 50 I I ll es l 1:0

